Function: keyedFold()

keyedFold(source): KeyedFold

Defined in: src/lib/time-travel/keyedFold.ts:251

The keyed fold for one source, memoized on the source object.

Memoized because a per-epoch reader asks the same source for the same keys at many different commits, and the index is the expensive half: building it is one pass over the log, and answering a read afterwards is a binary search plus a replay from the nearest full-value write (normally exactly one).

Parameters

source

FoldSourceLike | undefined

Returns

KeyedFold

Example

import { keyedFold } from 'agentfootprint';

const fold = keyedFold(agent.getSnapshot());
fold.basis;                      // 'initial+log' — the base travelled
fold.valueAt('history', 12);     // the conversation after the 13th commit
fold.valueAt('history', -1);     // …and what the run STARTED from